Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The ES29 is the top of the ES2 cast-iron line: 280 MBH fixed input against the ES28's 245 MBH, for 238 MBH DOE heating capacity (208 on the ES28) and a 207 MBH net AHRI rating (181), moving to the line's largest 8" draft hood and 564 lb shipping weight.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | Burnham ES2 ES28 | Burnham ES2 ES29 |
|---|---|---|
| Input | 245 MBH | 280 MBH |
| DOE heating capacity | 208 MBH | 238 MBH |
| Net AHRI water rating | 181 MBH | 207 MBH |
| Efficiency (AFUE) | 85 % | 85 % |
| Venting | Category I natural draft — draft hood into an existing lined chimney (Type B/L gas vent); 7" draft hood | Category I natural draft — draft hood into an existing lined chimney (Type B/L gas vent); 8" draft hood |
| Shipping weight | 518 lb | 564 lb |
| Gas connection | 3/4" NPT | 3/4" NPT |
| Supply/return connections | 1-1/4" NPT | 1-1/4" NPT |
| Maximum allowable working pressure (MAWP) | 50 psi | 50 psi |
| Electrical | 120 VAC, 60 Hz, 1-phase, 15 A | 120 VAC, 60 Hz, 1-phase, 15 A |
Both are non-condensing cast-iron ES2 boilers at 85% AFUE with fixed inputs, 3/4" NPT gas and 1-1/4" NPT supply/return, on the IQ Boiler Control System at 50 psi MAWP with a 30 psi shipped relief valve.
The ES29 fires a fixed 280 MBH against the ES28's 245 MBH, and the ratings table prints 238 MBH DOE heating capacity and a 207 MBH net AHRI water rating versus 208 and 181 MBH.
The ES29 carries the line's only 8" draft hood (the ES27 and ES28 use 7"), ships at 564 lb (484 lb empty) versus 518 lb (438 lb empty) on the ES28, and at 35" deep by 30-3/4" wide by 41" high is the widest member of the family. Both are Category I chimney-vented designs for large replacement loads.
Burnham
The Burnham ES2 ES28 fires a fixed 245 MBH input for 208 MBH DOE heating capacity and a 181 MBH net AHRI rating at 85% AFUE, with a 7" draft hood and 3/4" NPT gas — the second-largest non-condensing ES2 cast-iron size.
Burnham
The Burnham ES2 ES29 tops the ES2 cast-iron line at a fixed 280 MBH input: 238 MBH DOE heating capacity and a 207 MBH net AHRI rating at 85% AFUE, with the line's largest 8" draft hood for Category I chimney venting.
The ES29: 280 MBH fixed input, 238 MBH DOE heating capacity, a 207 MBH net AHRI water rating and an 8" draft hood — the only ES2 size with that hood.
The ES29 adds 35 MBH of input (280 vs 245), 30 MBH of DOE capacity (238 vs 208), 26 MBH of net AHRI (207 vs 181) and 46 lb of shipping weight (564 vs 518 lb).
No — the ES28 uses a 7" draft hood; the 8" hood is specific to the ES29.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 8, 2026. Last updated September 8, 2026. Technical reviewer: not yet assigned.